/*
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* Copyright (C) 2018 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef ART_RUNTIME_DEX_REGISTER_LOCATION_H_
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#define ART_RUNTIME_DEX_REGISTER_LOCATION_H_
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#include <array>
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#include <cstdint>
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#include "base/dchecked_vector.h"
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#include "base/memory_region.h"
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namespace art {
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// Dex register location container used by DexRegisterMap and StackMapStream.
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class DexRegisterLocation {
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public:
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enum class Kind : int32_t {
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kInvalid = -2, // only used internally during register map decoding.
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kNone = -1, // vreg has not been set.
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kInStack, // vreg is on the stack, value holds the stack offset.
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kConstant, // vreg is a constant value.
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kInRegister, // vreg is in low 32 bits of a core physical register.
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kInRegisterHigh, // vreg is in high 32 bits of a core physical register.
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kInFpuRegister, // vreg is in low 32 bits of an FPU register.
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kInFpuRegisterHigh, // vreg is in high 32 bits of an FPU register.
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};
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DexRegisterLocation(Kind kind, int32_t value) : kind_(kind), value_(value) {}
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static DexRegisterLocation None() { return DexRegisterLocation(Kind::kNone, 0); }
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static DexRegisterLocation Invalid() { return DexRegisterLocation(Kind::kInvalid, 0); }
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bool IsLive() const { return kind_ != Kind::kNone; }
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Kind GetKind() const { return kind_; }
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int32_t GetValue() const { return value_; }
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bool operator==(DexRegisterLocation other) const {
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return kind_ == other.kind_ && value_ == other.value_;
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}
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bool operator!=(DexRegisterLocation other) const {
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return !(*this == other);
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}
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int32_t GetStackOffsetInBytes() const {
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DCHECK(kind_ == Kind::kInStack);
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return value_;
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}
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int32_t GetConstant() const {
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DCHECK(kind_ == Kind::kConstant);
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return value_;
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}
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int32_t GetMachineRegister() const {
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DCHECK(kind_ == Kind::kInRegister ||
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kind_ == Kind::kInRegisterHigh ||
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kind_ == Kind::kInFpuRegister ||
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kind_ == Kind::kInFpuRegisterHigh);
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return value_;
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}
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private:
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DexRegisterLocation() {}
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Kind kind_;
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int32_t value_;
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friend class DexRegisterMap; // Allow creation of uninitialized array of locations.
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};
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std::ostream& operator<<(std::ostream& stream, DexRegisterLocation::Kind kind);
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std::ostream& operator<<(std::ostream& stream, const DexRegisterLocation& reg);
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} // namespace art
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#endif // ART_RUNTIME_DEX_REGISTER_LOCATION_H_
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